There is indication for 4K HDR content, but it not recognizes Dolby Vision as HDR just shows 4K.
The files have DOVI tags, etc, and DV in name.
There’s already a more general suggestion to visually indicate the availability of DoVi in a video (not limited to a particular client). You might want to consider commenting/voting in that thread in order to avoid distracting/dispersing votes.
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2022 clean-up: duplicate